CVE-2026-34098 Guardian Language-System XSS via id Parameter in media.php
An authenticated attacker can inject malicious scripts via the id parameter in media.php, leading to code execution in the victim's browser session.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-34098?
CVE-2026-34098 is a medium-severity cross-site scripting vulnerability in guardian language-system, published on 1 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Guardian language-system fails to sanitize the id GET parameter before inserting it into HTML source and form action attributes in media.php (lines 119, 129). An authenticated attacker can craft a URL that injects script tags executing in the victim's browser session.
Weakness: CWE-79
Which versions are affected by CVE-2026-34098?
How do I fix CVE-2026-34098?
No fix has been published for CVE-2026-34098 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-34098 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34098 exists.
Sources
Also known as GHSA-q7ff-88r7-jcwv.